Unlock new pieces of concept art in the Gallery by getting the following gamerpoints.

Unlockable gallery art	How to unlock
"Bad Cop" concept art	Unlock (0) Gamerpoints.
"Duke's Vehicle" concept art	Unlock (90) Gamerpoints.
"Sonic Resonator" concept art	Unlock (50) Gamerpoints.
"Trooper Recon Car" concept art	Unlock (90) Gamerpoints.
Alternative Pig Cop concept art (1 of 2)	Unlock (70) Gamerpoints.
Alternative Pig Cop concept art (2 of 2)	Unlock (70) Gamerpoints.
Jetpack concept art	Unlock (50) Gamerpoints.
Octabrain concept art (2 of 2)	Unlock (30) Gamerpoints.
Octabran concept art (1 of 2)	Unlock (30) Gamerpoints.
Pig Cop concept art	Unlock (10) Gamerpoints.